Every popular port has two versions. The one between ten and four, shared with several thousand day visitors, and the one that arrives when they have all left.
Azamara is built around the second. Staying late, or overnight, turns a stop into an evening: dinner where the locals eat, a square that has emptied out, a walk back through streets that were shoulder to shoulder a few hours earlier.
It is the same island either way. It simply does not feel like the same place.